MIME — MIME (Multipurpose Internet Mail Extensions) is an encoding method designed for exchanging binary files over the Internet (particularly via email messages) in a standardized, platform-independent form using a coding scheme called base64. A MIME-encoded message can contain several parts, each of which can be a different type of file: ASCII text, pictures, video, sound, or any other type of binary data.

MSID — The Master Subject ID for a class. This is generally the course number used in the registrar's system and to register Stellar sites. For subjects that are cross-listed (e.g. 2.003/1.053), the MSID is only one of the numbers listed.